Q (haiku): How many glioblastoma studies are in cBioPortal?

▶ list_studies
{
 "search": "glioblastoma",
 "limit": "100"
}

✗ error
<tool_use_error>Error: No such tool available: mcp__navigator__list_studies</tool_use_error>

▶ list_studies
{
 "search": "glioblastoma",
 "limit": 100
}

◀ result
{"result":[{"cancer_study_identifier":"gbm_tcga","name":"Glioblastoma Multiforme (TCGA, Firehose Legacy)","type_of_cancer_id":"difg","sample_count":619,"has_guide":false,"url":"https://www.cbioportal.org/study/summary?id=gbm_tcga"},{"cancer_study_identifier":"gbm_tcga_gdc","name":"Glioblastoma Multiforme (TCGA GDC, 2025)","type_of_cancer_id":"difg","sample_count":611,"has_guide":false,"url":"https://www.cbioportal.org/study/summary?id=gbm_tcga_gdc"},{"cancer_study_identifier":"gbm_tcga_pan_can_atlas_2018","name":"Glioblastoma Multiforme (TCGA, PanCancer Atlas)","type_of_cancer_id":"difg","sample_count":592,"has_guide":true,"url":"https://www.cbioportal.org/study/summary?id=gbm_tcga_pan_can_atlas_2018"},{"cancer_study_identifier":"gbm_tcga_pub2013","name":"Glioblastoma (TCGA, Cell 2013)","type_of_cancer_id":"difg","sample_count":577,"has_guide":false,"url":"https://www.cbioportal.org/study/summary?id=gbm_tcga_pub2013"},{"cancer_study_identifier":"gbm_tcga_pub","name":"Glioblastoma (TCGA, Nature 2008)","type_of_cancer_id":"difg","sample_count":206,"has_guide":false,"url":"https://www.cbioportal.org/study/summary?id=gbm_tcga_pub"},{"cancer_study_identifier":"gbm_cptac_2021","name":"Glioblastoma (CPTAC, Cell 2021)","type_of_cancer_id":"difg","sample_count":99,"has_guide":false,"url":"https://www.cbioportal.org/study/summary?id=gbm_cptac_2021"},{"cancer_study_identifier":"gbm_columbia_2019","name":"Glioblastoma (Columbia, Nat Med. 2019)","type_of_cancer_id":"difg","sample_count":42,"has_guide":false,"url":"https://www.cbioportal.org/study/summary?id=gbm_columbia_2019"},{"cancer_study_identifier":"gbm_iatlas_prins_2019","name":"Glioblastoma (Randomized Clinical Trial, Nat Med. 2019) - iAtlas Harmonized","type_of_cancer_id":"adifg","sample_count":30,"has_guide":false,"url":"https://www.cbioportal.org/study/summary?id=gbm_iatlas_prins_2019"}]}

═ answer (success)
There are **8 glioblastoma studies** in cBioPortal:

1. **Glioblastoma Multiforme (TCGA, Firehose Legacy)** — 619 samples
2. **Glioblastoma Multiforme (TCGA GDC, 2025)** — 611 samples
3. **Glioblastoma Multiforme (TCGA, PanCancer Atlas)** — 592 samples *(has curated guide)*
4. **Glioblastoma (TCGA, Cell 2013)** — 577 samples
5. **Glioblastoma (TCGA, Nature 2008)** — 206 samples
6. **Glioblastoma (CPTAC, Cell 2021)** — 99 samples
7. **Glioblastoma (Columbia, Nat Med. 2019)** — 42 samples
8. **Glioblastoma (Randomized Clinical Trial, Nat Med. 2019) - iAtlas Harmonized** — 30 samples

The **TCGA PanCancer Atlas** version is the recommended starting point for broad analysis (592 samples, curated guide available). The **TCGA GDC 2025** is the most recent TCGA release. CPTAC and institutional studies offer proteomics and mechanistic depth if those data types are relevant to your research question.